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5
7
3
1
1
9
4
2
6
2
8
2
7
3
1
4
9
2
7
4
7
2
6
8
2025-03-09(Advanced) Puzzles
Difficult number placement puzzles
Organize candidates step by step to complete the puzzle.
Tips for Solving Sudoku
- Start with squares with fewer numbers: Begin with rows, columns, or blocks that already have more numbers filled; fewer candidates make it easier to solve.
- Pencil marks (notes): For beginners, write possible numbers in small font in empty squares for reference.
- Review: If stuck, check for duplicate numbers or rule violations.
- Basic rule: Do not repeat the same number in the same row, column, or 3x3 block.